What is the expected change in respiratory rate (RR) during pregnancy?

During pregnancy, a woman's body undergoes numerous physiological changes to support the developing fetus, and one of these changes is an increase in the respiratory rate. This increase occurs primarily due to heightened metabolic demands and hormonal changes, particularly the rise in progesterone levels.

Progesterone acts as a respiratory stimulant, enhancing the sensitivity of the respiratory centers in the brain. Additionally, as the uterus expands, it exerts pressure on the diaphragm, which can lead to shallow breathing. As a compensatory mechanism, the body increases the respiratory rate to ensure adequate oxygenation for both the mother and the fetus.

Therefore, it is anticipated that a pregnant individual will experience an increased respiratory rate to meet these increased oxygen needs and support the overall metabolic changes that occur during pregnancy.